Yeah, HS Backroll, but your letting go with your front hand as if your going to go revert. To revert just give the handle a tug into your switch hip just after the mid point of the roll. You'll stop the revert easy!

Idk if you play it in slo mo it is not a backroll he turns and does a back flip I have no clue what the name of this is...it could be a backroll but from my view in slo mo u r turning and doing like a tantrum with a backroll in it.